Mechanism for lapping diamond dies



BLOUNT. MECHANISM FOR LAPPING DIAMOND DIES. APPLICATION FILED APR- 6, I920.

1,428,209, PatentedSept. 5, 1922.

1 2 SHEETSSHEET I- Zr'weflfir Harry BlozmT H. BLOUNT.

MECHANISM, FOR LAPPING DIAMOND DIES.

AP P L I CAT'ION HLED APR. 6. 1920.

Patented Sept. 5,- 192 2.

2 SHEETS-SHEET 2.

25 27 I "1777972707 m 54 /0 fiar yblozmT Patented Sept. 5, 1922.

HARRY BLOUNT, OF OAK PARK, ILLINOIS, ASSIGNOR TO WESTERN ELECTRIC COM- PANY INCORPORATED, OF NEW YORK, N. Y A CORPORATION OF NEW YORK.

MECHANISM FOR LAPPING- DIAMOND DIES.

Application filed April 6, 1920. Serial No. $71,718.- To all 'wlzomz't may concern: That end of the shaft which carries the 55 Be it known that I, HARRY BLOUNT, a gear 15 also carries a driving pulley 16 or citizen of the United States, residin at any suitable means for driving the shaft 13 Oak Park, in the county of Cook and tate from a suitable source of power (not of Illinois, have invented certain new and shown). The gears Hand mesh with useful Improvements in Mechanism for pinions 17 and 18 suitably secured tolap Lapping Diamond Dies, of which the folsupports21 and 22 which are supported lowing is' a ,full, clear, concise, and exact by bearings 23 and 24: in the frame 10 didescription. rectly above the shaft '13. The lap sup- 10' This'invention relates to mechanism for ports 21 and 22 comprise sleeve like memlapping diamond dies for'use in wire drawbers open at both ends, one end of each being operations. The object of the invention ing provided with restricted openings, 25 is to provide a mechanism whereby this lapand 26 respectively. A lap 27 in the form ping operation may be performed efficiently of music wire carries at one end a block or 15 and rapidly. head 28' which freely passes into the open- In accordance with the general features ing in the lap 'support 21 and against a wall of this invention, provision is made for apformed by the restricted opening 25. The plying a lateral pressure between a lapping lap 27 passes through a die holder, heremember and the die to be lapped whereby inafter to be described, into the opening in 20 the lapping operation may be speeded up. the lap support 22 and through the re- In the specific embodiment of this inven- .stricted opening 26 therein. By driving tion the holder for the die which is to be each lap support at each end of the lap lapped is pivotally supported upon a rothrough gears'l l and 15 andpinions 17 and tatable and reciprocal shaft in such a man- 18 the lap is revolved. without causing any' 25 ner that it may be laterally adjusted with torsional strain thereon. Thelap also pro-- respect to the lapping member which is jects outside of the lap support 21 and carsupported at both ends. Means are prories at its end an adjusting block 29 provided vided for adjusting the tension of the lapwith a shouldered portion. 31- which supping member and for equalizing the torports 'a compression. spring 32. Bearing 30 sional stress. against the outside end of the lap support Fig. 1 is a front elevation of the complete 22 is a second block 33 provided with a machine with a section broken away; shouldered portion 84t which receives the 1 Fig. 2 is a plan view thereof; opposite end of the spring 32. The pur- Fig. 3 is an end View looking from the pose of the spring 32 and the adjusting 35 right hand side of Fig. 1; block. 29 is to providemeans for putting Fig. 4 is a fragmentary vertical section a suitable tension on the lap, 27. This 1s taken on the line 1-4 of Fig. 1; done by compressing the spring 32 bymov- Fig. 5 is an enlarged fragmentary longiing the "block 29 against it and then turntudinal section taken on the line 5 5 of ing a set screw 35 located in the block 29 40 Fig. 1, and against the lap 27 Fig. 6 is a greatly enlarged cross-sectional A second driving shaft 36 is rotatably and view of the lap shown in relation to the slidably mounted in the frame 1 0 in bearopening in the die at the beginning of a 'ings 37 and '38 and projects through the lapping operation, the broken lines showside arms thereof. To one end of the shaft 45 ing the size of the opening in they die and- 36 1s secured a driving pulley 11' or any position of the lap at the end of an operasuitable means for driving .it from a suittion. I I able source of power (not shown), and upon As shown in thefdrawings, the operating the "opposite end thereof a cam 4-2. Interparts of the machine are supported on a U- mediate the side arms of the frame and 50 shaped frame 10 provided with bearings 11 rotatable on the shaft 36is an arm 43 proand 12 which support a shaft 13. The vided with a bearlng 4 1. In a bearing in shaft 13- projects through side arms of the the end of the arm 43 a chuck 4:6 is rotatably frame 10 and has secured. thereto on the secured which has secured concentric with projecting ends thereof gears 1 1 and 15. its axis a die holder 17 held in place by a plurality of set screws 48-4t8. The chuck 46 is provided with an extended sleeve-like portion 51 which rotates freely inside the bearing in the arm 43. Secured to the chuck 4-6 is a pulley 52 which is driven by a belt from a pulley secured to the drive shaft 36. A disk 54 secured to the chuck 46 secures it and. the arm 13 in their relative positions. Secured to a side face of the arm -13 intermediate its ends is a plate 55 carrying a roller 56 which rolls upon an adjustably inclined track 57 which is secured to an arm 58 pivoted on the shaft 36. The arm 58 is provided with a bearing 59 into which extends a bushing 61 secured in the bear ing 38. A point on the screw 62 in the bearing 59 projects into a circular groove 63 in the bushing 61 thereby locking the arm 58 from longitudinal movement, but allowing a movement about the shaft 36. The arm 58 is provided wit-h a handle portion. 64 which bears against an adjusting screw 65 carried on the frame 10. By varying the adjustment of the screw 65 against the handle 64 the die can be made to bear on the lap with varying pressures. When removing or inserting a die holder, the handle portion 64 is depressed to a position where an opening 66 therein is in line with a locking pin 67 which is then inserted in the opening 66. This movement of the handle 64 raises the other end of the arm 43 upward through the engagement of the roller 56 and the track 57, thereby allowing the removal or insertion of a die holder. One end of a compression spring 78 abutting against the side arm of the frame 10 and its other end against the arm 43 and surrounding the shaft 36 and the bearing 44 of the arm 13 maintains the face of the cam 42 always in contact With a roller 71 mounted on a bracket 72 secured to the frame 10.

The speed of rotation of the die holder can be controlled by varying the diameters of the pulleys 52 and 53. As shown in the drawings, the lap is revolved at high speed relative to the speed of rotation of the die, and also in the opposite direction, The re volving of both the lap and the die holds the lapping compound which is applied to the lap or in the die opening, therebypreventing it from being thrown by centrifugal force to the outside of the die holder with the consequent wastage thereof and its frequent replenishing.

In the lapping of diamond dies by the use of this invention from one size to the next size or to greater sizes, which dies are used particularly for drawing wire to certain sizes, a lap is used which is a trifle smaller in diameter than the size of the die to be lapped. This is clearly illustrated in Fig. 6.

After mounting the die holder in the end of the arm 43 the pin 67 is withdrawn from the opening 66 in the arm 13 which is then allowed to turn about the shaft 36 until the opening in the die is concentric with the axis of the lap holders 21. and 22. The lap 27 is then threaded through the openings in the lap holders and tension is put on it by compressing the spring 32 and setting the adjustable block 29 thereafter. By turning the screw 65 upward the die is allowed to bear on the lap and when the desired pressure thereon is attained the screw 65 is set against the handle 64. Power is then applied to the shafts 13 and 36, and as the shaft 36 revolves, it is reciprocated back and forth due to the cam 21-2 riding against the roller 71, thereby carrying the die, which is also revolving, through the belt connecting the pulleys 52 and 53 back and forth over the lap. The lap at the same time is revolving at high speed compared to the speed of rotation of the die and in the opposite direction through the gears 14: and 15 secured to the shaft 13 and the pinions 17 and 18 secured to the lap supports 21 and 22.

The lap being supported at both ends and with means provided for applying suitable pressure on the lap, the opening in the die can be enlarged in much less time than by the use of old methods. Also the reciprocation of the die along the lap prevents the wearing of it in one short place, the wear being distributed evenly along the length of reciprocation and at the same time the lapping medium is carried into the lapping position by the die moving along the lap.

What is claimed is:

1. In a machine for lapping a wire drawing die, a rotatable die holder, a rotatable lapping member, and means for applying lateral pressure between the die and the lapping member.

2. In a mechanism for lapping a wire drawing die, a die holder, a die lapping member, means for giving the lapping member and the die holder a combined rotating and TQCll'JIOCZLtlDg' motion relative to each other, said. reciprocal a fixed plane and rotatable member, a lateral pressure lapping member.

3. In a mechanism for lapping a wire drawing die, a rotatable die holder, mechanism for reciprocating and rotating said die holder, a rotatable lapping member supported at both ends, and means for moving the die holder laterally of the lapping mem her to cause a lateral pressure between the lapping member and the die.

1. In a mechanism for lapping a wire drawing die, a die holder, a rotatable and reciprocating shaft upon which the die holder is pivotally stnaported for recipro cation, means for transmitting rotatable motion from the shaft to the die holder, a lap member moving in parallel to the axis of the and means for applying between the die and the ping member supported at both ends and extending through the die holder, and adjustable supporting means for the die holder for determining its lateral position with respeet to the lapping member.

5. In a mechanism for lapping a wire drawing die, a rotatable die holder, a rotatable lapping member supported at both ends and extending through the die holder, means for adjusting the tension of the lapping member, and means for controlling the lateral pressure between the lapping member and a die in the die holder.

6. In a mechanism for lapping a wire drawing die, a die holder, a flexible lapping member supported at both ends, and means for rotating both ends of said lapping member at the same speed thereby preventing torsional strain thereon. In witness whereof, I hereunto subscribe my name this 23rd day of March A. 1)., 1920.

HARRY BLOUNT. 

